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How to calculate the monthly water fee 15 yuan and check-in 12 days?

Hello, the water fee should be determined according to the water meter.

Should not be measured in days,

There must be a difference in water consumption every day.

If you have to calculate by the day,

It should be 15 yuan divided by 30 days multiplied by 12 days.

It should be 6 yuan,

Hope to adopt, thank you.